Silver chloride is a chemical compound with formula . Its darkening under illumination supplied the chemical readout in the historical ultraviolet discovery described above. That response depends on the incident optical spectrum and the sample's condition; it does not provide an uncalibrated direct measurement of incident power. [ref]
https://coolcosmos.ipac.caltech.edu/page/lesson_ritter_experiment. Caltech/IPAC, Ritter's silver-chloride detector
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